#div {
    width: 320px;
    /* height: 80px; */
    border: 1px solid #000;
    background-color: #1A1A1A;
}

#time {
    list-style: none;
    padding: 0;
    margin-left: 60px
}

#time li {
    display: block;
    width: 50px;
    height: 30px;
    float: left;
    margin: 10px 0 10px 20px;
    border: 2px solid #ccc;
    background-color: #fff;
    line-height: 30px;
    color: #000;
}

#time span {
    display: block;
    float: left;
    line-height: 50px;
    margin-left: 10px;
    color: #fff;
}
#btn{
    width: 260px;
    height: 40px;
    border-radius: 10px;
    margin: 20px auto;
    background-color: #45BF4E;
    border: 1px solid #2B2B2B;
    font-size: 18px;
    color: #fff;
}

#btn.exit{
     width: 260px;
     height: 40px;
     border-radius: 10px;
     margin: 20px auto;
     background-color: #A13335;
     border: 1px solid #2B2B2B;
     font-size: 18px;
     color: #fff;
}
.clear{
    clear: both;
}